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Table 3 BAVM morphologic classification associated with unfavorable hemorrhage riska

From: Pediatric brain arteriovenous malformation unfavorable hemorrhage risk: extrapolation to a morphologic model

Characteristics Type Ia (n = 30) Type Ib (n = 29) Type II (n = 52) Type III (n = 51)
Morphologic Features
 Nidus location Periventricular and non-temporal (corpus callosum, basal ganglia or thalamus) Periventricular and non-temporal (frontal, parietal, occipital lobe or cerebellum) Non-periventricular or temporal lobe Non-periventricular or temporal lobe
 Long pial draining vein 13 (43.3) 14 (48.3) 52 (100.0) 0 (0)
Hemorrhage
 mRS at bAVM rupture
  ≤ 2 9 (30) 12 (41.4) 30 (57.7) 41 (80.4)
  >2 21 (70) 17 (58.6) 22 (42.3) 10 (19.6)
 Unfavorable hemorrhage
  No 12 (40.0) 15 (51.7) 38 (73.1) 48 (94.1)
  Yes 18 (60.0) 14 (48.3) 14 (26.9) 3 (5.9)
Follow-up period, patient-years 367 280 667 711
Annual rate of unfavorable hemorrhage, % 4.9 5.0 2.1 0.4
Spetzler-Martin Grade
 I-II 7 (23.3) 20 (70.0) 30 (57.7) 29 (56.9)
 III 11 (36.7) 6 (20.7) 14 (26.9) 18 (35.3)
 IV-V 12 (40.0) 3 (10.3) 8 (15.4) 4 (7.8)
  1. aTable entries are No. (%)